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Arrange to "inline" SQL functions that appear in a query's FROM clause,

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are declared to return set, and consist of just a single SELECT.  We
can replace the FROM-item with a sub-SELECT and then optimize much as
if we were dealing with a view.  Patch from Richard Rowell, cleaned up
by me.
This commit is contained in:
Tom Lane
2008-03-18 22:04:14 +00:00
parent 433c5238bf
commit 0d49838df6
8 changed files with 424 additions and 48 deletions
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4
src/include/optimizer/clauses.h
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/clauses.h,v 1.88 2008/01/01 19:45:58 momjian Exp $
* $PostgreSQL: pgsql/src/include/optimizer/clauses.h,v 1.89 2008/03/18 22:04:14 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -79,6 +79,8 @@ extern Node *eval_const_expressions(Node *node);
extern Node *estimate_expression_value(PlannerInfo *root, Node *node);
extern Query *inline_set_returning_function(PlannerInfo *root, Node *node);
extern bool expression_tree_walker(Node *node, bool (*walker) (),
void *context);
extern Node *expression_tree_mutator(Node *node, Node *(*mutator) (),

3
src/include/optimizer/prep.h
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/prep.h,v 1.59 2008/01/01 19:45:58 momjian Exp $
* $PostgreSQL: pgsql/src/include/optimizer/prep.h,v 1.60 2008/03/18 22:04:14 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -22,6 +22,7 @@
* prototypes for prepjointree.c
*/
extern Node *pull_up_IN_clauses(PlannerInfo *root, Node *node);
extern void inline_set_returning_functions(PlannerInfo *root);
extern Node *pull_up_subqueries(PlannerInfo *root, Node *jtnode,
bool below_outer_join, bool append_rel_member);
extern void reduce_outer_joins(PlannerInfo *root);